// Copyright 2016 The Rust Project Developers. See the COPYRIGHT
// file at the top-level directory of this distribution and at
// http://rust-lang.org/COPYRIGHT.
//
// Licensed under the Apache License, Version 2.0 <LICENSE-APACHE or
// http://www.apache.org/licenses/LICENSE-2.0> or the MIT license
// <LICENSE-MIT or http://opensource.org/licenses/MIT>, at your
// option. This file may not be copied, modified, or distributed
// except according to those terms.

#![crate_type = "lib"]
pub trait Future {
    type Item;
    type Error;
}

impl Future for u32 {
    type Item = ();
    type Error = Box<()>;
}

fn foo() -> Box<Future<Item=(), Error=Box<()>>> {
    Box::new(0u32)
}

pub fn bar<F, A, B>(_s: F)
    where F: Fn(A) -> B,
{
    foo();
}
